Traveling-grate furnace.



:ai 8mm/BLE so?? 898,488

J. HARRINGTGN.

TRAVELING GRATE FURNAGB. APPLICATION FILED SEPT. 2s. 1904.

.Y 898,468. A Patented Sept. 15,1908.

2 SHEETS-SHEET 2,

UNITED s'rn'rnsA PATENT OFFICE.

' JOSEPH HARRINGTON, OF CHlCAGO, ILLINOIS, ASSIGNOR TO GREEN ENGINEERING COM- PANY, or cnlcAco, ILLINOIS@ CORPORATION OF ILLINOIS.

TRAVE LIN G-GRATE l FURNACE specification of Letters Patent.

Patented Sept. 15, 1908'.

Application filed September 28, 1904. Serial No. 2276,41?.

To all whom it may concern.'

Be it known that I, JOSEPH HARRINGTON, of Chicago, in the county of Cook and State of Illinois, have invented certain new and -useful Improvements in Traveling-Grate for closing the space between the layer of ashes resting on the'grate of an automatic stoking furnace and the part of the bridge wall of such furnace which overhangs the rear end of the grate to prevent the passage of air between the rear end of the grate and bridge* wall, and more especially to an adjustable vwater cooled bridge piece or water back adapted for adjustment.` toward and from the .top or supporting surface of the grate and which, by such adjustment, serves' to provide a wider or narrower space for the v passage of the layer of fuel beneath the same. The invention consists in the matters hereinafter described and pointed out in the y appended claims.

As shown in said drawings :-Figure l is a view in longitudinal vertical'section of the rear end-of the furnace and a' bridge wall there located, showing in side view the rear portion of'a traveling chain grate. Fig. 2 is a transverse section, taken upon line 2-2 of Fig. 1. Fig. 3 is a detail, longitudinal section of the bridge piece. Fig; 4 is an enlarged detail cross-section of the bridgle piece and adjacent parts of the bridge wa Fig. 5 is an end view of thebridge piece. Fig. 6 is an external view offa supporting plate for one'end of the bridge piece, illustrating devices for shifting or moving the bridge. pie'ce located at theouter face of said plata Fig. 7 is a 'detail section corresponding with Fig. 4 showing a modi-fied form of the bridge ieee. Fig. 8 is a detailsection of that endo the bridge piece, shown in Fig.. 7,

through .which water is suplied to and makes its exit from the sai( bridge iece.

As illustrated in the accompanying rawings, A A1 indicate the side walls of a steam boiler furnace B indicates the rear end or inner ortion of a traveling chain grate', and

A2 a ridgeiwall which extends across the furnace at the rear of the grate and is provided with' a forwardly projecting part A3 whlch ove'rhangs the rear end of the grate, 4

C indicates a tu-bular or hollow water cooled bridge piece which extends across the furnace over the rear part of the grate in contact with the overhanging part' A3 of the bridge wall, and which serves toclose the space or opening between the bridge wall and the layer of fuel on the grate against the passage of air. As shown in the drawings, and

vpreferably constructed, said bridge piece consists of a tube `closed at its ends by heads .C1 C2; said tube, as shown in Figs. 1 to 6, belng of cylindric form or circular in cross sec- '.tion, and, as shown in Figs. 7 and 8, being oblong in cross-section. The said tubular bridge piece C extends at its ends past the inner faces of the side walls of the furnace, and being made longer than the space between said side walls, while the main part of said bridge piece extends above the overvllhanging part A3 of the bridge wall in contact therewith. Moreover, said bridge piece is bodily movable or capable of being shifted relatively to the bridge wall, so that it may be raised and lowered to carry its lower part toward and from the surface of the grate beneath it.

ed at its ends in supports sustained on the side walls ofthe furnace, so that it may swing or rotate in a curved path toward and from the grate, while it always"y 'jmains in contact with the said overhangin'g .part of the bridge wall to prevent the vpassage of air between it andthe said bridge wall.

As illustrated in Figs. 1 to 6, the pivotal axis on which the bridge piece moves when it isbodily swung, is located outside of its own diameter and concentrically with respect to a convexly curved or rounded sur- -face a formed at the intersection of the bot- To effect such bodily shifting of the bridge piece the latter is pivotally mounttom and forward faces of the overhanginDr part A3 `of the bridge wall, so that, as said ridge piece is swung or moved, it. slides around or over said convex surface. As shown in Figs. 7 and'8, however, the' hollow bridge piece turns on an axis within itself and its part adjacent to the bridge wall is made of cylindricform concentric with the axis on which -the bridge piece swings, while the overhanging part A3 of the bridge wall is provided With a concave surface al (Fig. 7) which fits against said convex inner part of the bridge piece, thereby maintaining a close wall in all positions intov which the bridge pieceis swung or moved in effecting its ad- To the outer end ci the neck c is attached a- Justnient.

As shown in Figs. 1 to 6, means for pivotally supporting the bridge piece C are constructed as follows: ln the`side walls A A1, adjacent to the ends of the cverhanging part A3 of the bridge Wall, are formed o enings or recesses A4 A5 adapted to receive t e ends of the said bridge piece C. 1n' the recessl A4 is located a bearingplate D which is provided with a horizontal base flange d adapted 'to rest u on the part oil the wall below it said plate being located inthe part of said wall exterior to the recess A4. Said bearing plate D. is provided with a bearing vaperture d1 ,Within which rests a .bearing pin orl trunnion c which is connected with the head C1 ofthe bridge piece C by means of a rigid arm c1. A

bearing plate D for the opposite end of the bridge piece is located at the outer faceof the side wail A1 and closes the recess A5. Arectanguiar metal frame D2 is built in the wall A1,

` at the outer part of the recess A5, `andlis provided. with an inwardl extending -flange d2 to which the bearing p ate l)1 is bolted at its margins, so that the .said bearing plate is made detachable from the furnace `wall.vv

'c4L is adapted at its outer end for the attachment thereto of a supply lpipe or hose C3 and is provided adjacent to t e trunnion c2 with square or flat sided parts c" ada ted toreceive the correspondingly sha e sochet'in the hub ci a lever E, by whic swinging or oscillatory movement may be given to the "bridge piece. The head C2 of the bridge piece is also provided with a tubular neck-c whichl forms also a water pipe or passage, The neel; c passes through a curved slot d4 in the hearing plate D1, which slot is curved concentricaliy with the bearing aperture c3.

second supply hose C4. A sliding, segmental cover plate F is applied to the.l late D1' in such'manner as to cover the slot, 4, said plate D1 being provided with an -aperture for the passage oi the neck c and having sliding movement with said neck. y Said cover plate is made long enough to colver said slot in all ositions of thefnech c5, as clearly seen in A segmental bar F1 is secured to the'outer face of the plate D1 concentrically with the 'pivotal axis of'the lever E. and devicesfare 4"provided for locking said lever ,to the 'said segmental bar at'various points 1n the'movee or 'assage, andy ment of the" lever, so that the bridge piece may be locked or held firmly in any-oi the )several positions to which it may beshifted or adjustedby movement oi the saidv lever E. The locking devices for the lever El..

herein-shown, consist of a pin e ada ted to be inserted throu h the lever E and t irough lone oi several` ho es f j f formed in said segmental bar F1. y i

From the construction described it will be manifestthat by -shifting the lever E, the

Joridge piece C may. be adjusted or swung on its axis to bring it. into any desired position with res ect to the projection A3 of the bridge wall. .llhen the bridge piece is in its lowermost position, as shown in Fig. 1, it rests beneath theoverhanging partA3 of the bridge wall.,"but when swung to its uppermost position, as shown in dotted lines in Fig. 4, it will stand'athe front of said overhanging part- Aa, with its lower surface only slightly below the level-:fot the lower surface of the said v overhangiiigpart of the bridge wall. By ad- 'ustingl the ridge piece, as described, its ower surface may be brought to a position 'at greater orless distance vertically above the ,top surface of the grate, 'according to the thickness of the layer ci ashes or-wholiy or partly burned zout -*fuel which rests'on .the

' part of the gratebeneath it. lat is of course to be understood that the bridge piece will be so adjusted, according to the rate of feed of the fuel, as 'to permit' the layer of 'ashes or' burned outproducts of combustion on the grate to pass beneathl it, while at the same time maintaining, so far as possible,- continnous contact of the bottom of the/.bridge piece with the top surface of the saidvlayer 'of ashes or burned out fuel. p y

.Now reierrinr more particularly to lthe means employed -for maintaining a circula'- tion oi water within the hollow bridge'piec'e', the tubular arm c3 and nipple c4 inonecas`,

land the' neck c in the other case', constit;utc/

water supply and Areturn passages through *which water is deliveredvto and makes its-exit from the interior of the brid e piece, the connecting pipe or hose C3 C4 being employed to connect said nip leu:4 and neck@6 with suitable supply an return-pipes. ln the particular construction illustrated, the arm c3 and nipple c4 constitute they exhaust'ordelivery passage, while the neck c'iorms the supply passage for the water which iscirculated in the ,bridgev piece; The construction illustrated in the water circulating means embraces certain novel features, as follows: G indicates a pipe which extends longitudif 'nally oi the bridge piece within the same and is attached at one end tofthe head C2 in such manner that it is in open communication with the neck c6; The o posite or free end oi thepipe extends througli the interior of the bridge iece to la point near the head C1.

Water elive'red through the supply hose 'Ct ist scenes attached to its inner end a laterally extending curved arm 'h'which extends along the inner surface of the bridge piece substantially parallel with said inner surface. The said arm 7i. is so located as to be at the upper part of 'the bridge piece in all positions binto which the said bridge piece is' moved or swung; said arm 7i being herein shown as extending through about one-tourth of the circuinference of the bridge piece. Said arm 7i is open at its free end, and in its top surface are formed a series of holes or perforations /t1 lil. The purpose of the curved arm `h 1s to prevent any considerable quantity of air beoutside of the furnace 4which is secured by .the bridge lpiece may be swung ing confined or trapped lwithin the upper part of the bridge piece in anv'position of the same, it being manifest that the open end of said\ pipe and the perforations in said pipe, located adjacent to the upper wall ofthe bridge piece, afford vents for any air accumulating in the top of the bridge piece, and which will tend to pass outwardly from the interior of the bridge piece through the exit pipe or passage formed by the pipe ll, arm c3 and nipple ci.

To facilitate the separation of the parts and removal of the pipes G and Il from the interior of the bridge piece, the head C2 is preferably secured by means of boltsoto a flanged ring C5 screw-threads or otherwise on the adjacent end of the tube con stituting the body of the bridge piece.

The bridge piece made dscribed may be readily removed from the furnace by iirst (,lisconnecting thc supply Aand return pipes C3 (1*, taking oli` the lever E and plate lf and thon detaehing the. bearing plate l)l from the furnace wall and slipping it oil' of the trunnion c2 and neck c". After said plate l') has been so removedv the bridge piece may be removed cndwise lthrough the opening Ayloi, il there be not room at the for such endwise removal of the bridge piece, the latter may be detached from the bearing plato l) and shifted endwise lar enough to carry its trunnion c out of the recess A after which horizontally `within the furnace until it reaches a position permitting its opposite end to. be taken out of or removed from the recess A, after which the lbridge piece may be removed through the front opening of the furnace.

The construction of the bridge piece shown in Figs. 7 and 8 is substantially theI saine as thatillustrated in the figures 'ieretofore deand supported as scribed excepting that the tubular arm c3 and neck cgare made straight, as shown 1n Fig. 8, instead of being curved.

By providing the side walls of the furnace with recesses into which the ends of the metal bridge piece extend, and by locating the bearing or supporting plates, in wluch the trunnions of the bridge piece have bearing7 at the outer faces of said side walls, the said bearing plates and also the pivotal supports of the bridge piece engaged therewith, are removed from the direct action of the iire and therefore not liable to be injured by heat. By having the supply and return pipes connected with the bridge piece arranged to extend through the bearing plate to the outside of the furnace wall, the supply or return pipes or hose are entirely outsi e of the furnace and will not be aeeted bythe heat so that iiexible hose may be used to make the supply and return connections between the exterior, or stationary, supply and return pipes and thesupply or return pipes connected and moving with the bridge piece. Moreover, by this. construction it becomes unnecessary that either the supply or return passages should be carried through the trunnion of the' movable bridge piece although this latterl construction is shown in the accompanying drawings and is preferred, because somewhat simplifying the construction'of the parts.

I claim as my invention 1. The combination with a bridge wall having an overhanging part, of a pivotally mounted bridge piece located in contact -with said overhanging part of the bridge wall, said overhanging part of the bridge wall being rovided with a convexly curved bearing surace adapted for'contact with the bridge piece in all positions of the latter.

2. The combination with the side walls of a furnace of a fuel grate, a bridge wall, a holl low tubular bridge provided at its en( with eccentric trunnions; said.. side walls of the furnace being provided with recesse's at the ends ofthe bridgewall into which the ends of said'brid e piece extend and which are larger than t e said ends of the bridge piece to aord spaces for the lateral adjustment thereof, means for 'adjusting the bridge piece and holding it in its adjusted position, and water su ply and return pipes connected with said) -bridge piece. i

3. The'v combination with the sidewalls and bridge Wall of a furnace,4 a tubular bridge piece of cylindric form provided at its ends with-eccentric trunnions; said side walls of the furnace being provided with recesses at the ends of the bridge 'wall into which the ends of the bridge piece extend, supporting plates attached to the outer part of said side walls in which said trunnions of the bridge piece have bearing, and means for adjustlpiece of cylindric form' y 1/6/ being tubular and forming part of the passage by which water is supplied tothe in- Lerior of the bridge piece.

5. A hollow bridge piece having oscillatory movement in a curved path provided with a 15 water supply passage and with a water exit passage, which latter is formed in part by a separate pipe which extends into the interior space of the bridge piece and is provided with an inlet aperture located at the top of said 2.0 s ace to permit the outward passage of air t ierefrom.

6. A hollow bridge ieee having oscillatory movement in a curve path, said bridge piece being provided with a water supply passage 25 and wlth a water exit passage formed in part by a pipe which extends into the interior ot the bric ge piece and is curved to conform to the top surface of the same and is perforated to admit the passage of air from the interior of said bridge piece.

7. The combination with the side walls and bridge wall oi a furnace, of a hollow or tubular bridge piece provided at one end with two tubular arms, one of which forms a trunnion for the bridge piece, said tubular arms forming passages by which water is supplied to and makes its exit from said bridge piece, anc a bearing plate Jfor said i',runnion, said bearing plate being' provided with a segmental slot for the assage of one of said tubular arms and wit i a-sliding plate which moves with said arm and covers said slot.

ln'testimony, that lf claim the foregoing as my invention alix my signature in presence of two witnesses, this 20th day of September A. D. 1904.

JOSEPH HARRINGTON.

Witnesses WV. L. HALL, D. E. MARMON. 

